649194673 has 2 divisors, whose sum is σ = 649194674. Its totient is φ = 649194672.

The previous prime is 649194661. The next prime is 649194703. The reversal of 649194673 is 376491946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594774544 + 54420129 = 24388^2 + 7377^2 .

It is a cyclic number.

It is not a de Polignac number, because 649194673 - 2¹³ = 649186481 is a prime.

It is not a weakly prime, because it can be changed into another prime (649194613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324597336 + 324597337.

It is an arithmetic number, because the mean of its divisors is an integer number (324597337).

Almost surely, 2^649194673 is an apocalyptic number.

It is an amenable number.

649194673 is a deficient number, since it is larger than the sum of its proper divisors (1).

649194673 is an equidigital number, since it uses as much as digits as its factorization.

649194673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 49.

The square root of 649194673 is about 25479.2989110768. The cubic root of 649194673 is about 865.8812109607.

The spelling of 649194673 in words is "six hundred forty-nine million, one hundred ninety-four thousand, six hundred seventy-three".